Mercurial > hg > WSGraph
annotate wsgraph/web.py @ 19:8162dc8dd93a
fix this thing
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Mon, 10 Dec 2012 17:44:11 -0800 |
| parents | b710a2374c8d |
| children | 542232f858a9 |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 """ | |
| 4 web handler for WSGraph | |
| 5 """ | |
| 6 | |
| 7 import json | |
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8 import sys |
| 0 | 9 from webob import Request, Response, exc |
| 10 | |
| 5 | 11 # rank constants |
| 4 | 12 GRAPH = 0 |
| 13 NODE = 1 | |
| 14 EDGE = 2 | |
| 15 | |
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16 # XXX stubbing hack |
| 7 | 17 class JSONformatter(object): |
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18 |
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19 def __init__(self, content_type='application/json', sort_keys=True): |
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20 self.content_type = content_type |
| 7 | 21 self.sort_keys = sort_keys |
| 22 | |
| 19 | 23 def format(self, instance): |
| 24 """front-end to json.dumps""" | |
| 25 return json.dumps(instance, sort_keys=self.sort_keys) | |
| 7 | 26 |
| 27 def node(self, node, graph, request): | |
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28 return Response(content_type=self.content_type, |
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29 body=self.format(graph.node(node))) |
| 7 | 30 |
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31 def edge(self, node1, node2, graph, request): |
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32 return Response(content_type=self.content_type, |
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33 body=self.format(graph.edge(node))) |
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b710a2374c8d
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34 |
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35 def graph(self, graph, request): |
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parents:
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36 return Response(content_type=self.content_type, |
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b710a2374c8d
more stubbing, goddamn content_type
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parents:
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37 body='hello? is it me you\'re looking for?') |
| 0 | 38 |
| 39 class Dispatcher(object): | |
| 40 | |
| 41 def __init__(self, graph, | |
| 5 | 42 graph_formatters=None, |
| 43 node_formatters=None, | |
| 44 edge_formatters=None, | |
| 0 | 45 require_auth=False): |
| 46 self.graph = graph | |
| 47 self.require_auth = require_auth | |
| 5 | 48 |
| 49 # use JSON formatter by default | |
| 50 if graph_formatters is None: | |
| 51 graph_formatters = {None: JSONGraphFormatter} | |
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52 if node_formatters is None: |
| 5 | 53 node_formatters = {None: JSONFormatter} |
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54 if edge_formatters is None: |
| 5 | 55 edge_formatters = {None: JSONFormatter} |
| 56 | |
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57 # view formatters |
| 5 | 58 self.formatters = {GRAPH: graph_formatters, |
| 59 NODE: node_formatters, | |
| 60 EDGE: edge_formatters} | |
| 16 | 61 for key, value in self.formatters.items(): |
| 5 | 62 # ensure default formatter |
| 63 assert None in value | |
| 0 | 64 |
| 3 | 65 self.methods = dict([(i, getattr(self, i)) |
| 66 for i in dir(self) | |
| 67 if i.isupper()]) | |
| 68 | |
| 0 | 69 def __call__(self, environ, start_response): |
| 70 request = Request(environ) | |
| 3 | 71 method = self.methods.get(request.method) |
| 72 if method is None: | |
| 73 return exc.HTTPMethodNotAllowed()(environ, start_response) | |
| 74 response = method(request) | |
| 0 | 75 return response(environ, start_response) |
| 76 | |
| 77 @staticmethod | |
| 5 | 78 def path_segments(path): |
| 79 """split a path into segments""" | |
| 80 segments = path.strip('/').split('/') | |
| 81 if segments == ['']: | |
| 82 segments = [] | |
| 83 return segments | |
| 0 | 84 |
| 85 # HTTP methods | |
| 86 | |
| 87 def GET(self, request): | |
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88 """ |
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89 respond to a GET request |
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90 |
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91 Formatters are keyed off of |
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92 |
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93 formatters = {0: { |
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94 } |
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95 |
| 4 | 96 A graph formatter takes the following arguments: |
| 97 | |
| 6 | 98 def sample_graph_formatter(graph, request): |
| 99 | |
| 100 A node formatter takes the following arguments: | |
| 101 | |
| 102 def sample_node_formatter(node, graph, request): | |
| 103 | |
| 104 An edge formatter takes the following arguments: | |
| 105 | |
| 106 def sample_edge_formatter(edge, graph, request): | |
| 4 | 107 |
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108 API: |
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109 |
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110 ?format=<format> |
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111 |
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112 """ |
| 0 | 113 |
| 7 | 114 # get resource requestor |
| 5 | 115 segments = self.path_segments(request.path_info) |
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parents:
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116 rank = len(segments) |
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parents:
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117 if rank not in (0,1,2): |
| 4 | 118 return exc.HTTPNotFound() |
| 0 | 119 |
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parents:
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120 # is resource in the graph? |
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parents:
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121 if (rank == EDGE) or (rank == NODE): |
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421d5119e324
reluctantly make this a CLI entry point
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parents:
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122 if tuple(segments) not in self.graph: |
| 14 | 123 return exc.HTTPNotFound() |
| 7 | 124 |
| 0 | 125 # formatter |
| 126 formatter = self.formatters[len(segments)] | |
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127 return formatter(*segments, self.graph, request) |
| 0 | 128 return Response(content_type='text/plain', |
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129 body=content) |
| 0 | 130 |
| 131 def POST(self, request): | |
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132 """ |
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133 respond to a POST request |
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134 |
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135 API: |
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136 |
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137 ?update : |
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138 """ |
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139 |
| 4 | 140 return exc.HTTPSeeOther(location='/') # TODO: /path/to/self |
| 0 | 141 |
| 142 def HEAD(self, request): | |
| 143 """respond to a HEAD request""" | |
| 144 raise NotImplementedError | |
| 145 | |
| 3 | 146 def OPTIONS(self, request): |
| 4 | 147 return Response() # TODO: Allow=', '.join(self.methods); Content-Length=0 |
| 3 | 148 |
| 0 | 149 |
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150 def main(args=sys.argv[1:]): |
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421d5119e324
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parents:
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151 """example web server""" |
| 3 | 152 |
| 0 | 153 # imports |
| 154 from wsgiref import simple_server | |
| 3 | 155 from model import MemoryCache |
| 156 from optparse import OptionParser | |
| 0 | 157 |
| 3 | 158 # parse command line options |
| 159 parser = OptionParser() | |
| 160 parser.add_option('-p', '--port', type='int', default=8080, | |
| 161 help="port to serve on") | |
| 162 options, args = parser.parse_args() | |
| 163 | |
| 164 # example model | |
| 0 | 165 graph = MemoryCache() |
| 166 | |
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167 # example formatter(s) |
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168 # TODO |
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169 |
| 3 | 170 # WSGI app |
| 0 | 171 app = Dispatcher(graph=graph) |
| 3 | 172 server = simple_server.make_server(host='0.0.0.0', port=options.port, app=app) |
| 173 print 'http://localhost:%s/' % options.port | |
| 0 | 174 server.serve_forever() |
| 175 | |
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176 if __name__ == '__main__': |
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177 main() |